Infection from an ameba called Naegleria fowleri that is commonly found in the environment, in water and soil. It is found worldwide, most commonly in warm bodies of fresh water, such as lakes, rivers, and hot springs; warm water discharge from industrial plants; and under-chlorinated swimming pools.N. fowleri normally eat bacteria, but when it enters humans, it uses the brain as a food source.
The treatment of choice is an intravenous drug called amphotericin B. Amphotericin B may also be instilled directly into the brain. Miltefosine is a drug that has shown promise, and it is available through the Centers for Disease Control and Prevention. Treatment should be initiated as rapidly as possible, and immediate consultation with an infectious-diseases expert is highly recommended.